This study investigated how managers, entry-level employees, and hiring professionals in the optics and photonics industry socialize each other to enact the communication norms and expectations in their workplaces. A qualitative analysis of transcripts from interviews conducted with 33 employees at 15 companies produced five prevalent themes related to what optics and photonics employees consider competent communication (proactive questioning, efficient decision-making, familial-like humor, tactful translation, and fluent modality switching) and three socialization processes (presumed competence, informal mentoring, and structured training). These competencies and processes necessitate what we term "cross-occupational communication": an interactive, iterative process involving communicative needs assessment, information exchange, and rhetorical/situational flexibility with groups distinct in background, training, and occupational role. It is difficult to create workplace-like experiences that truly capture the field-specific communication practices involved in organizational socialization within traditional classrooms; therefore, we argue for systematic and intentional communication in the disciplines instruction that considers cross-occupational communication needs in the workforce.